Knowledge of species diversity is essential for ecological research and conservation planning, especially in overlooked ecosystems, such as the Sechura desert (SD) and the Tumbesian dry forest (DF) of Peru and Ecuador. Little is known about mammal richness in these Threatened ecosystems and thus, we quantified the richness of medium to large-sized mammals within and outside of protected areas. We used direct observation, tracks, interviews, and photographic records from 279 camera-trap locations distributed in 11 localities: three in the SD and eight in the DF. From 3839 camera-days and 56 interviews, we recorded 20 native and seven exotic species, more species than any single-locality study on these ecosystems. The most common species was Lycalopex sechurae, while the rarest species were Herpailurus yagourundi, Galictis vittata, Leopardus wiedii, and Mazama americana. We highlight southward extensions ranges for G. vittata and Lontra longicaudis and propose the southern distribution limit in the western Andes for the last four species mentioned above. We found that DF protected areas harbor higher species richness than non-protected areas but, unfortunately, up to four exotic species. These updated inventories will help direct management decisions and highlight the importance of non-protected areas as key landscapes for potential mammal connectivity.

物种多样性知识对于生态研究和保护规划至关重要，尤其是在秘鲁和厄瓜多尔的Sechura沙漠（SD）和Tumbesian干旱森林（DF）等被忽视的生态系统中。对于这些受威胁的生态系统中的哺乳动物丰富度知之甚少，因此，我们对保护区内外的中型到大型哺乳动物的丰富度进行了量化。我们使用了分布在11个地区的279个相机陷阱位置的直接观察，跟踪，采访和摄影记录：三个位于SD，八个位于DF。通过3839个摄影日和56次采访，我们记录了20种本地物种和7种外来物种，比这些生态系统的任何单地点研究都多。最常见的物种是Lycalopex sechurae，而最稀有的物种是Herpailurus yagourundi，Galictis vittata，Leopardus wiedii和Mazama americana。我们着重介绍了G. vittata和Lontra longicaudis的向南扩展范围，并提出了上述最后四个物种在安第斯山脉西部的南部分布范围。我们发现，DF保护区的物种丰富度高于非保护区，但不幸的是，多达四个外来物种。这些更新的清单将有助于指导管理决策，并强调非保护区作为潜在的哺乳动物连通性的关键景观的重要性。